I was also wondering why few of the villages were near water...then again with the crazy stuff on Carcosa that might dwell in or near the water I guess it does make sense.
Also with all the Dinosaurs and giant bugs, this has got to be a typical day on Carcosa.
After re-watching those Skull Island scenes from the 2005 King Kong it made me really appreciate just how terrifying Carcosa would be on a day to day basis. Oh lets go get a drink of water...crap, Billy got eaten by a giant leech!
In D&D statistics you probably have to be a third level fighter just to survive crawling out of the womb on Carcosa.